A novel two-phase thermal approach for synthesizing CdSe/CdS core/shell nanostructure

作者：Suganthi A R Baby; Joshi Amish G; Sagayaraj P^*

来源：Journal of Nanoparticle Research, 2012, 14(2): 691.

DOI：10.1007/s11051-011-0691-6

• Solvothermal
• Semiconductor
• Nanoparticles
• Core/shell
• HRTEM
• XPS
• Nanocomposites

CdSe/CdS core/shell nanocrystals have been synthesized through a low cost and simple twophase thermal route. The optical spectroscopy and structural characterization evidenced the core/shell structure of the CdSe/CdS nanoparticles. The X-ray diffraction patterns of CdSe and CdSe/CdS nanoparticles exhibited peak positions corresponding to those of their bulk cubic crystal structures. The X-ray photoelectron spectroscopy data confirmed the elemental composition of the CdSe/CdS nanoparticles. The absorption spectra of core/shell nanoparticles showed red shift with respect to the core CdSe nanoparticles. The photoluminescence study indicates that the intensity of the emission maximum is considerably increased in the core/shell structure as compared with the parent material, and the capping of CdS nanoparticles with CdSe material exhibit a near band-edge emission, indicating a successful passivation by removing surface defects. The high-resolution transmission microscope images of the bare and core/shell nanoparticles ascertained the monodispersed and well-defined spherical particles. The average particle sizes for CdSe and CdSe/CdS nanoparticles are 2.5 and 5 nm, respectively, thus confirming, the larger diameter of CdSe/CdS core/shell nanostructure than the core CdSe nanoparticles.

• 出版日期2012-2